Dop for holding precious stones to be ground.



E. LOESSER.

DOP FOR HOLDING PRECIOUS STONES TO BE GROUND.

APPLICATION FILED JUN 27, 1912.

1,088,234. Patented Feb. 24,191

UNITED STATES PATENT OFFICE.

ERNEST LOESSER, OF BLOOMFIELD, NEW JERSEY, ASSIGNOR OF THREE-FOURTI-IS TO SAMUEL JAGOBSON, TRUSTEE, OF NEW YORK, N. Y.

DOP FOR HOLDING PRECIOUS STONES TO BE GROUND.

Original application filed June 2, 1910, Serial No. 564,346.

To all whom it may concern:

Be it known that I, ERNEST Lonssnn, a citizen of the United States of America, residing in Bloomfield, county of Essex, State of New Jersey, have invented a certain new and useful Improved Dop for Holding Precious Stones to be Ground, of which the following is a specification.

In the accompanying drawings: Figure 1, is a top plan view: Fig. 2, a side elevation: Fig. 3, a vertical longitudinal section.

This new dop has a tapered end 1 in which is secured by a molding operation a stone 2 to be ground. At the other end oi the dop is a circular series of recesses whose center is coincident with the axis of the dop in which the stone lies. This circular series of recesses may be in the form of a toothed or ratchet wheel or ring 3 rigidly and inseparably forming part of the dop being made practically integral with the body thereof by the same molding operation by which the stone is attached to the apex end of the dop. The axial line in which the stone is held is co-incident with the axis of the toothed ring 3.

The described mode of forming or making this dop may be varied. Thus the dop may be cast as a slug with the stone molded in its end and be by appropriate tooling reduced to form. The toothed or ratchet wheel 3 whose teeth are to be properly spaced and proportioned and may in practice be 82 in Specification of Letters Patent.

Patented Feb. 24, 1914.

Divided and this application filed June 27,

Serial No. 706,151.

number affords a positive means for determining the successive position to which the stone may be turned to grind successive facets of a series.

Thisdop may be used in connection with grinding or polishing apparatus described and claimed in an application filed by me June 1, 1910, Ser. No. 564,347; and is a division of my application Ser. No. 564,346 filed June 2, 1910.

I claim:

1. A dop to be used in grinding or polishing precious stones comprising a tapered body at the apex end of which the stone is held and a toothed wheel at or adjacent the larger end of the body of the dop whereby the dop may be rotated through known positively determined distances for successive grinding or polishing of facets upon the stone.

2. A dop to be used in grinding or polishing precious stones comprising a molded tapered body in the apex end of which the stone to be operated upon is molded and a toothed wheel also molded into the body of the dop and located suitably adjacent its larger end.

In testimony whereof, I have hereunto subscribed my name.

' ERNEST LOESSER. Witnesses:

S. A. STORY,

L. T. BROWNlNG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 0! Patents, Washington, D. C. 

